Pres: 30K troops, no endless commitment

President Barack Obama is sending 30,000 extra U.S. troops to Afghanistan on an accelerated timetable that will have the first Marines there as early as Christmas and all forces in place by summer. But he'll also declare Tuesday night that troops will start coming home just one year later.

In a prime-time speech to the nation from West Point, N.Y., that ends a 92-day review, Obama will seek to sell his bigger, costlier plan for the 8-year-old stalemated war to a skeptical public in part by twinning it with some specifics about an exit strategy, said two senior administration officials. They spoke on condition of anonymity because the president had not yet laid out his plans.

Obama will tell the American people that U.S. troops will start handing over lead responsibility to Afghanistan forces and leaving the country in July 2011, one official said. The official said Obama will not promise a date by which that process will be complete, as the pace of ending the war will depend on conditions on the ground.

A third senior U.S. official said Obama will lay out an ambitious calendar for the arrival of the full measure of additional forces over the first six months of 2010, although the actual arrivals may stretch out a couple of months beyond that.

Obama's demand for faster-than-planned deployments, the official said, is a nod to the urgency that the U.S. commanding general in Afghanistan laid out bluntly at the start of the president's more than three months of deliberations.

The officials said that the primary mission of the additional forces will be to turn back years of gains by the Taliban-led insurgency and protect the Afghan population, as well as improve the U.S. ability to train Afghan security forces to begin taking over security on their own.

Military officials said at least one group of Marines is expected to deploy within two or three weeks of Obama's speech, to arrive by Christmas -- a recognition by the administration that something tangible needs to happen quickly.

Most of the new forces will be combat troops. Military sources said the Army brigades most likely to be sent will come from Fort Drum in New York and Fort Campbell in Kentucky. Marines, who will be the vanguard, will most likely come primarily from Camp Lejeune in North Carolina.

But one "brigade-sized element" -- meaning 3,000 to 5,000 troops -- will be devoted to training, officials said. And the president is making clear to his generals that all troops, even if designated as combat, must consider themselves trainers for mentoring Afghan forces.

The additions will bring U.S. forces above 100,000 by next summer.

If the timeline holds, it will require a costly logistical scramble to bring in so many people and so much equipment almost entirely by air. It will also probably require breaking at least an implicit promise to some soldiers who had thought they would have more than 12 months at home before their next deployment. Officials would not detail ahead of Obama's speech what compromises would be made to meet the president's speedier timeline.

With U.S. casualties in Afghanistan sharply increasing and little sign of progress from the war's beginning in 2001, the war Obama has called one "of necessity," not choice, has grown less popular with the public and within his own Democratic Party. In recent days, leading Democrats have talked of setting tough conditions on deeper U.S. involvement, or even staging outright opposition.

Obama is acknowledging the divided public opinion with his emphasis on an exit, as well as on the stepped-up training to help Afghan forces take over and a series of specific demands for other governments, including Afghanistan, Pakistan and NATO allies, to contribute more.

Unease with Obama's approach to the war in both parties was on display even before he spoke and was sure to be in evidence on Capitol Hill later this week when congressional hearings.

With the full complement of new troops expected to be in Afghanistan next summer, the heightened pace of Obama's military deployment appears to mimic the 2007 troop surge in Iraq, a 20,000-strong force addition under President George W. Bush. Similar in strategy to that mission, Obama's Afghan surge aims to reverse gains by insurgents and secure population centers in the most volatile parts of the country.

In his speech and in meetings overseas in the coming days, Obama also will ask NATO allies to contribute more -- between 5,000 and 10,000 new troops -- to the separate international force in Afghanistan, diplomats said.

One official from a European nation said the troop figure was included in an official NATO document compiled from information received from Washington ahead of Obama's announcement. The NATO force in Afghanistan now stands at around 40,000 troops.

Obama also will make tougher demands on the governments of Pakistan and, especially, Afghanistan.

In Afghanistan, rampant government corruption and inefficiency have made U.S. success much harder. Obama